OPTIMIZATION ANALYSIS OF HIGH PROFITABLE DEVELOPMENT FOR WATER-DRIVE UNCONSOLIDATED SANDSTONE GAS RESERVOIRS

Based on system analysis,a novel development optimization model is presented for water-driven unconsolidated sandstone gas reservoirs.Which utilizing well-rounded theories and methods such as models of gas-water flow in porous medium,equations of gas-liquid flow in wellbore and throttle models etc.,and combined pressure drop from production formation to sand surface,downhole movable choke,wellbore,wellhead choke,and the surface gathering and transportation lines,and it can be resolved by Heuristic Algorithm or Simulated Annealing Algorithm.Compared with conventional optimization production models with local and short time,overall production system optimization could be realized by the new model,which is beneficial to reduce damage to gas reservoirs,and establish rational working system for a gas well,ensuring gas reservoirs high-stable production.